Why OpenBSD Developers Use CVS

The Concurrent Version System (CVS) maintained by Cyclic Software was selected for use by
the OpenBSD project group. With CVS, seventy or so developers are able to
update the source code (which is over 1349 MB, around 75000 files) that
comprise the OS, ports/packages, and XFree86. A large number of OpenBSD users
can download the OS sources via anonymous CVS,
a procedure that is much more reliable than the Software
Upgrade Protocol (sup).

CVS also allows easy creation and maintanance of branches so that we
can provide a release + patches source tree and a up to the minute
development source tree with parallel development.

Since CVS interfaces with the Secure SHell (ssh) it can provide reliable
user and host authentication. This fits in well with the OpenBSD
project's goal of security.